How does that crude approximation make it any easier? I am pretty fluent in conversion just by remembering that 10 Celsius degrees are equivalent to 18 Fahrenh

How does that crude approximation make it any easier? I am pretty fluent in conversion just by remembering that 10 Celsius degrees are equivalent to 18 Fahrenheit degrees, then practicing counting by 10s: -4°F, 14°F, 32°F, 50°F, 68°F, 86°F, 104°F Once you have those under your belt you can figure most earthly air temperatures pretty quickly and exactly.